Template Metaprogramming: Type Traits Part 1 CppCon 2020 1 Jody Hagins
 jhagins@maystreet.com 
 coachhagins@gmail.comTemplate Metaprogramming: Type Traits CppCon 2020 2 IntroductionIntended Audience necessarily beginner to C++, but beginner to traditional template metaprogramming techniques • Type traits part of standard library for ~10 years 3Intended Audience • Beginner/Intermediate • Gentle necessarily beginner to C++, but beginner to traditional template metaprogramming techniques • Type traits part of standard library for ~10 years • Fundamentals have been in use for ~20 years 3Intended

CurveBS I/O processing flow Before introducing IO processing flow, we first describe the overall architecture, data organization and topology structure of CURVE. CurveBS uses the central the NEBDServer, which affects services in few seconds. CurveBS IO processing flow Overall process The flow of user's read and write request to curve: 1. The user initiates a request (fd=1 6. At last, the Client notifies the user that the request is completed.Chunkserver processing flow CopysetNode is essentially a wrapper around the RAFT algorithm. The Copyset module encapsulates

Data Stream Processing and Analytics Vasiliki (Vasia) Kalavri
 vkalavri@bu.edu Spring 2020 4/09: Flow control and load shedding ??? Vasiliki Kalavri | Boston University 2020 Keeping up with the producers queue: what if the queue grows larger than available memory? • block the producer (back-pressure, flow control) 2 ??? Vasiliki Kalavri | Boston University 2020 Load management approaches 3 ! Load applications with strict latency constraints that can tolerate approximate results. Slow down the flow of data: • The system buffers excess data for later processing, once input rates stabilize.

step Basic types Practice Next step Collections List Set Map Practice Next step Control flow Conditional expressions Ranges Loops Practice Next step 61 61 61 61 63 63 63 64 64 expressions for loop while loop when expression Ranges Collections Nullable values and null checks Type checks and automatic casts Idioms Create DTOs (POJOs/POCOs) Default values for function parameters properties of an object (apply) Java 7's try-with-resources Generic function that requires the generic type information Swap two variables Mark code as incomplete (TODO) What's next? Coding conventions

Literals §7. Constants and Variables - also introduces untyped values and type deductions. §8. Common Operators - also introduces more type deduction rules. §9. Function Declarations and Calls §10. Code Packages Basic Control Flows §13. Goroutines, Deferred Function Calls and Panic/Recover Go Type System §14. Go Type System Overview - a must read to master Go programming. §15. Pointers §16. Structs §17. §23. Interfaces - value boxes used to do reflection and polymorphism. §24. Type Embedding - type extension in the Go way. §25. Type-Unsafe Pointers §26. Generics - use and read composite types §27. Reflections

its components and features constexpr mp::vector v{mp::meta}; static_assert(is_same_vtype_of>); struct empty {}; static_assert(diagnose_member_name() == "`empty` to add static reflection to C++. • Reflection operator ^T that returns the meta information of a type • Metafunctions are functions that takes and returns meta information: members_of(^T), name_of(^T) result.value(); result.error();Monadic Operations Safely access the wrapped result value. The context type can change between monadic operations. std::expected result = foo(); auto transformed

Getting Started Basic Syntax Idioms Coding Conventions Basics Basic Types Packages Control Flow: if, when, for, while Returns and Jumps Classes and Objects Classes and Inheritance Properties Destructuring Declarations Type Checks and Casts: 'is' and 'as' This Expression Equality Operator overloading Null Safety Exceptions Annotations Reflection Scope Functions Type-Safe Builders Experimental 274 275 276 281 285 288 293 298 306 313 319 319 325 344 344 358 369 369 4 Dynamic Type Calling JavaScript from Kotlin Calling Kotlin from JavaScript JavaScript Modules JavaScript Reflection

Literals §7. Constants and Variables - also introduces untyped values and type deductions. §8. Common Operators - also introduces more type deduction rules. §9. Function Declarations and Calls §10. Code Packages §12. Basic Control Flows §13. Goroutines, Deferred Function Calls and Panic/Recover Go Type System §14. Go Type System Overview - a must read to master Go programming. §15. Pointers §16. Structs §17 Interfaces - value boxes used to do reflection and polymorphism. §24. Type Embedding - type extension in the Go way. §25. Type-Unsafe Pointers §26. Generics - use and read composite types §27. Reflections